You can
put this solution on YOUR website!Assuming the field is a square and has area = 4.58 on the horizontal,
it has a side of sqrt(4.58) = 2.1401..
------------------------------------------
The 15% slope has a gradiant of 0.15*90 degrees = 13.5 degrees
----------------------
The horizontal side projects to a hypotenuse of a right triangle
with an angle of 13.5 degrees adjacent to the 2.1401.. base.
----------------------
The length of that projected hypotenuse is 2.1401../cos(13.5)
= 2.2009..
----------------
Therefore the horizontal square projects to a quadrilateral with area
= 2.2009*2.1401 = 4.71012 ha
===============
Cheers,
Stan H.
(